for vendor in list accounts values for account in list vendor children

for vendor in list(accounts.values()):
    for account in list(vendor.children.values()):
        item = QtGui.QListWidgetItem('%s ( %s %s - %s )'%(account.login,
                                                          account.name,
                                                          account.sname,
                                                          account.pos),
                                     self.__contacts_list)
        item.setData(QtCore.Qt.UserRole, QtCore.QVariant(account.login))
        self.__contacts_list.openPersistentEditor(item)
        self.__accounts[account.login] = account


##----------------------------------------------------------------------------- [ CLASS : ContactsDelegate ]
##
class CheckBoxDelegate(QtGui.QItemDelegate):
    def __init__(self, parent):
        #
        self.__parent = parent
        #
        super(CheckBoxDelegate, self).__init__()
    ##
    ##
    ##------------------------------------------------------------------------- CREATE EDITOR
    ##
    def createEditor(self, parent, option, index):
        editor = QtGui.QCheckBox(parent)
        editor.installEventFilter(self)
        self.connect(editor, QtCore.SIGNAL('stateChanged(int)'), self.__parent.recvSelectionChanged)
        return editor
    ##
    ##
    ##------------------------------------------------------------------------- SET EDITOR DATA
    ##
    def setEditorData(self, editor, index):
        editor.setText(index.data().toString())
    ##
    ##
    ##------------------------------------------------------------------------- SET MODEL DATA
    ##
    def setModelData(self, editor, model, index): pass
    ##
    ##
    ##------------------------------------------------------------------------- UPDATE EDITOR GEOMETRY
    ##
    def updateEditorGeometry(self, editor, option, index): editor.setGeometry(option.rect)
    ##
    ##
    ##------------------------------------------------------------------------- [ END CLASS ]